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French Expertise Report (2015-12-21) for the 'VLRs' GIG: IBD 2007: Context, abiotic variables included, pressure-impact relationships

Abstract : As part of a ONEMA-Irstea work-action whose implementation should range between mid-2015 and 2017, France is conducting a study to develop a national Ecological Assessment System for the Very Large Rivers (VLRs). These rivers are more difficult to assess than others, taking into account the fact that reference situation for such large hydrosystems no longer exists in our country. Fortunately, the development of a new national evaluation system could correspond with the start of a European intercalibration exercise whose purpose is to verify the similar level of evaluations between EU Member States, on the basis of a common intercalibration standard. As part of this exercise, in addition to abiotic datasets and to diatom samplings collected on assessed national sites, various kinds of information are requested by the E.U., in order to characterize the national assessment system and its performance in terms of human pressure diagnosis. The present technical note This note first recalls some contextual information about structuring and development elements of the national diatomic index (IBD 2007). It then make the state of pressure - impact relationships which ould be illustrated from the responses of IBD, at 2 different typological levels: 1) on a complete national dataset including all the rivers sizes ; 2) on a selection of data collected exclusively on Very Large Rivers (integrated watershed areas of more than 8 000 Km2). Finally, IBD responses have also been tested, through preliminary trials, on the expression of autecological traits. This work will be continued and deepened during 2016.
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Contributor : Migration Irstea Publications <>
Submitted on : Saturday, May 16, 2020 - 7:59:35 AM
Last modification on : Tuesday, September 7, 2021 - 3:54:09 PM


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  • HAL Id : hal-02602552, version 1
  • IRSTEA : PUB00046820


Juliette Tison-Rosebery, Michel Coste, François Delmas. French Expertise Report (2015-12-21) for the 'VLRs' GIG: IBD 2007: Context, abiotic variables included, pressure-impact relationships. irstea. 2015, pp.16. ⟨hal-02602552⟩



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